1. Oil cooler is beneficial on track, you wont beleive how quick the oil temp creeps when your out playing. 2. If your stock rad is in good condition, then it should be ok. If you get temp troubles then put a alloy Civic rad in, and yes there better for cooling. 3. Oil temp and oil pressure, is a must if tracking alot. Water temp would be next as the stock gauge is shite, once ithe stock gauge moves upwards of the middle position your already cooking the motor pretty badly. Most of all, enjoy yourself, dont be trying fast lap times to impress anyone.